Energy Efficient Design Of Light Sand Autoclaved Aerated Concrete Block Self-insulation System And Technical Research For Finishes

Light sand autoclaved concrete block is valued by the construction industry and gradually become the preferred wall material in Self-insulation System, because of its advantages of light quality, good insulation properties and outstandingprocessability. However, there are also some problems during its application, for example, the correction factor for thermal conductivity of wall body varies in differentspecifications, which lead to heat transfer coefficient of walls exist large differences between the calculated value and actual cases, and limits the application of light sand autoclaved concrete block in cold climate regions. On the other hand, n cold regions, low temperatures in winter require good insulation performance of walls, and if the aerated concrete block can satisfy the energy-efficient requirements in this region need to be verified. In addition, the construction technology of aerated concrete block is complicated, and the phenomenon likewall cracking, large area crack in plaster layer, as well as detached are common. In this context, researches about how to solve above problems were conducted in this paper.In the first place, the investigation about overseas and domestic research status were conducted in terms of the verification of correction factor for thermal conductivity, energy-efficient design, crack resistance and penetration prevention for finishes, and following studies were carried out aiming at solving mentioned problems. Through thermal calculation, the effects of correction factor for thermal conductivity to energy-efficient design of autoclaved aerated concrete block self-insulation system. And six groups of autoclaved aerated concrete block wall for testing were designed. The study of correction factor for thermal conductivity was conducted the guarded hot box. It shows that the correction factor for thermal conductivity of the wall body which using professional masonry mortar and with 3～4mm mortar joint is1.05, and for the wall body using normal masonry mortar and wi10～11mm mortar joint is1.26. Moreover, the mortar joint thickness of aerat concreteself-insulation block wall applying in cold climate is better between3-4mi Professional masonry mortar should be used. And if normal masonry mortar was adopted, it better to take certain construction measures, e.g. filling polyurethane, to satisfy t requirements on wall insulation performance in cold climate.On the basis of previously obtained correction factor for thermal conductivity of aerat(?) concrete self-insulation block wall, the material substitutions of typical projects we conducted, which include dwelling houseand public buildings by TBEC. Above simulati(?) proves that aerated concrete self-insulation block wall as homogenous material can satis relevant energy-efficient requirements in cold climate. The effects of correction factor f(?) thermal conductivity to energy-efficient design of autoclaved aerated concrete block wall w(?) studied by parametric analysis on correction factor for thermal conductivity, wall thicknes and insulation thickness of thermal bridge. The economical thicknessof B04level wall determined. At last, the economic feasibility of this material applied in cold regions we discussed, via per unit area cost analysis of aerated concrete self-insulation block wall ar previous exterior insulation systems.After that, the techniques for finishes of this aerated concrete self-insulation block w(?) were investigated, and the existing problems were found. At last, water tightness test and wat vapor absorption test were conducted on aerated concrete masonry with different finishes order to study the crack seepage prevention ability of aerated concrete self-insulation blo(?) wall with different finishes. And on the basis of above experimental results, the princip elements that affect tthe crack seepage prevention ability of aerated concrete self-insulatic block wall were analyzed. The requirements of materials for finishes, wall masonry princip and processing mode for material interface were proposed.